Adam is working as a Database Administrator （DBA） for TeleSoft Corporation. His database is running in the ARCHIVELOG mode. During database startup， he discovers that one of the disks crashed， resulting in the permanent loss of a read-write USERS tablespace. The USERS01.dbf datafile belongs to the USERS tablespace and is 500 MB in size. He needs to recover the USERS tablespace from the backup. While reviewing the backup details， he discovers that the most recent available backup is five days old. This backup was taken when the USERS tablespace was read-only. After correcting the hardware problem that caused the failure， what should Adam do to recover the USERS tablespace？（） [" Restore the USERS01.dbf file from the backup， and open the database using the STARTUP command."," Restore the USERS01.dbf file using the RECOVER TABLESPACE command， and open the database using the ALTER DATABASE OPEN statement."," Restore the USERS01.dbf file from the backup， recover the USERS tablespace using the RECOVER TABLESPACE command， and open the database using the ALTER DATABASE OPEN statement."," Restore the USERS01.dbf file from the backup and change the status of the USERS tablespace from read-only to read-write using the ALTER TABLESPACE USERS READ WRITE statement. Then， recover the USERS tablespace using the RECOVER TABLESPACE command， and open the database using the ALTER DATABASE OPEN statement."]
在三相四线制中，中线的电流（）。 ["一定等于零","三相的代数和","三相矢量和"]
试述教育社会学不同于教育学科群中其他学科的特征。
Given: What is the result?（） ["Compilation fails.","An exception is thrown at runtime.","doStuff x = 6 main x = 6","doStuff x = 5 main x = 5","doStuff x = 5 main x = 6","doStuff x = 6 main x = 5"]
液化石油气站所用的灭火器是（）。 ["干粉灭火器；","CO2灭火器；","消防水枪"]
临界风速
